The one you posted was the original setup. They were revised off that one and the true dual in theory should flow better. There aren't any actual dyno's and most people that have purchased haven't dyno'd. Rasp isn't bad with any of their setups and with resonated test pipes and the possibility of adding a HFC down the road, the rasp will not even be noticeable.
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R.I.P. 8/01/13 1SlowZ
One day I'll have another....
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